3(2+4r)=21-r

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Solution for 3(2+4r)=21-r equation: 



3(2+4r)=21-r

We move all terms to the left:

3(2+4r)-(21-r)=0

We add all the numbers together, and all the variables

3(4r+2)-(-1r+21)=0

We multiply parentheses

12r-(-1r+21)+6=0

We get rid of parentheses

12r+1r-21+6=0

We add all the numbers together, and all the variables

13r-15=0

We move all terms containing r to the left, all other terms to the right

13r=15

r=15/13

r=1+2/13

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